A cement chemical shrinkage testing device and testing method

A technology of chemical shrinkage and testing device, applied in the direction of material inspection products, etc., can solve the problems of inability to measure chemical shrinkage value, inability to measure shrinkage value, increase operation complexity, etc., to achieve complete test results, large test time range, The effect of short operating time

Inactive Publication Date: 2016-01-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that a specific water-cement ratio can be selected for testing, but the measured value is actually the volume shrinkage of the hardened cement paste, and the shrinkage value of the cement before hardening cannot be measured
In general, various test methods increase the complexity of the operation, increase the operating time, and cannot measure the early chemical shrinkage value of the cement after adding water

Method used

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  • A cement chemical shrinkage testing device and testing method
  • A cement chemical shrinkage testing device and testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, the steps are as follows:

[0026] (1) Insert a No. 8 syringe needle into the "0" scale end of a 5ml glass graduated tube, and fix and seal the needle and the graduated tube with epoxy resin. After the epoxy resin is solidified, first inject a drop of engine oil into the glass scale tube through the needle, and then pour water into the glass scale tube to the full scale. Then fix the glass scale tube vertically on the bracket.

[0027] (2) Weigh 50g of cement, put it into a 50ml glass syringe with the outlet facing down, put the push handle of the glass syringe into the glass syringe, turn the syringe upside down, make the outlet upward, and then push the handle up into the syringe to a certain depth.

[0028] (3) Inhale 15ml of water from the outlet of the syringe, or use another 5ml syringe to inject 15ml of water into the test syringe in 3 times, block the outlet of the glass syringe and shake the glass syringe to fully mix the cement and water.

[00...

Embodiment 2

[0032] Embodiment 2, the steps are as follows:

[0033] Test the chemical shrinkage value of 50g of cement under the condition of 0.3 water-cement ratio according to the operation of Example 1. The first reading time is the time when the syringe is finally fixed, which is about 1 minute after adding water to the cement. According to the change of the liquid level in the glass scale tube, read the volume shrinkage of different ages and convert it into chemical shrinkage. Taking time as the abscissa and the chemical shrinkage as the ordinate, draw the curve of the volumetric chemical shrinkage per unit weight of cement over time, which is denoted as curve A.

[0034] The chemical shrinkage of cement with the same mass and water-cement ratio is tested by traditional methods. Put 50g of cement into a glass bottle, add 15g of water and stir evenly, insert a rubber stopper with a glass measuring tube into the bottle mouth, and seal it with vaseline and paraffin. Use a dropper to a...

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Abstract

The invention provides a cement chemical shrinkage testing device and testing method, which is composed of a glass scale tube, a syringe needle, a glass syringe and a bracket. By utilizing the good sealing properties of the syringe and the needle and the convenience of disassembly and assembly, a rapid test operation can be achieved, and the The chemical shrinkage information of earlier cement hydration age; at the same time, using the needle to control the water volume, the chemical shrinkage test of cement slurry with different water-cement ratio can be realized; the test device is simple to prepare, easy to operate, and its test results are reliable .

Description

Technical field [0001] Background technique [0002] [0003] [0004] Invention content [0005] [0006] [0007] [0008] [0009] [0010] [0011] [0012] [0013] [0014] [0015] [0016] [0017] [0018] [0019] The beneficial effect of the invention is: [0020] Attachment description [0021] figure 1 It is a diagram of the device of the present invention. [0022] figure 2 [0023] Detailed ways [0024] [0025] [0026] [0027] [0028] [0029] [0030] [0031] [0032] [0033] [0034] [0035] figure 2 ,, figure 2 [0036] From figure 2

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/38
Inventor 朱洪波李晨闫美珠成轶杰
Owner TONGJI UNIV
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